Deleting bad PEC training

[BC]

I've been attempting to use the PEC on my EQ6 for the first time. I was doing the PEC training routine, hoping to beat the clouds but at 6 1/2 minutes, I lost the star. This meant the last 1 1/2 minutes were not properly trained. Can I delete a 'bad' training session or do I just need to do a number of additional runs to overcome the error?

Thanks,
Bruce

[BC]

Hmm, not sure if no response means people aren't sure, or my question is unclear.

Here's a different, but related question. If I wish to refine my PEC training by doing a number of training sessions, do I run the mount at "Siderial" or "PEC + Siderial" rate?

Thanks,
Bruce